How do I check how many diplomatic relations I have?

[bobapplepie]

I want to know if I'll exceed my limit or not.

[Dreamers]

Diplomacy page of you own nation shows you the details about the ones you have and the limit.

But you don't have to worry if you are exceeding the limit it shows a warning and in the diplomatic points per month breakdown it shows there so you know what and how much you are losing to it.